0,1

See A054871 for definitions and key links.

This sequence is also a(0)=0, a(1)=1, a(n)=H_{n-1)(4,4) for n>1.

Table of n, a(n) for n=0..4.

a(0) = H_0(4,2) = 2+1 = 3

a(1) = H_1(4,2) = 4+2 = 6.

a(2) = H_2(4,2) = 4*2 = 8.

a(3) = H_3(4,2) = 4^2 = 16.

a(4) = H_4(4,2) = 4^^2 = 4^4 = 256.

a(5) = H_5(4,2) = 4^^^2 = 4^^4 = 4^4^4^4 = 4^4^256 = ...

Cf. A054871, A067652.

Sequence in context: A032912 A123208 A179652 * A298860 A068979 A101060

Adjacent sequences: A253852 A253853 A253854 * A253856 A253857 A253858

nonn,less,bref

Natan Arie' Consigli, May 02 2015

First term corrected and hyperoperator notation implemented by Danny Rorabaugh, Oct 20 2015

approved